20220921-002: Chapter 25-8 Formatted Working Copy — original pdf

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 25 26 27 PART 1. Subsection (F) of City Code Section 25-2-1007 (Parking Lots) is amended to read: (F) A landscaped area that is required by this section: (1) may consist of non-contiguous portions, and may be in the form of features commonly referred to as medians, peninsulas, and islands; (2) must be evenly distributed throughout a parking lot, except that the distribution and landscaped area may location of accommodate existing trees or other natural features if the total area requirement is satisfied; [and] (3) may count toward compliance with Section 25-2-1003(A) (General Requirements); and (4) must have an edge-of-pavement treatment that allows overland flow of stormwater runoff across the landscape area except: (a) (b) perimeter landscape areas that are not required to drain to a stormwater control measure; impervious areas on which the land use or activity may generate highly contaminated runoff, as prescribed by the Environmental Criteria Manual; and (c) sites located within the Edwards Aquifer recharge zone. PART 2. City Code Section 25-2-1008 (Irrigation Requirements) is amended to read: 23 § 25-2-1008 IRRIGATION REQUIREMENTS. [(A) An area equal to at least 50% of the total required landscaped area on a project must: (1) be undisturbed natural area(s) or undisturbed existing trees with no potable irrigation; or Page 1 of 62 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 (2) be irrigated by stormwater runoff conveyed from impervious surfaces on the site using one or more of the following methods: (a) overland flow; (b) storm drains; (c) downspouts; (d) rainwater harvesting; (e) retention-irrigation; or (f) other methods of conveyance as prescribed by rule. (B) The drainage area used to irrigate under Subsection (A) must be calculated to provide sufficient water for the landscaped area, as prescribed by rule. (C) Unless the landscaped area under Subsection (A) is being designed as a water quality control under Section 25-8-211, the drainage area used to irrigate the landscaped area: (1) may not include impervious areas on which the land use or activities may generate highly contaminated runoff, as prescribed by rule; and (2) may not include impervious areas used for parking or driving of vehicles if located within the Edwards Aquifer Recharge Zone as defined in Section 25-8-2.] (A)[(D)] No permanent irrigation is required for all or a portion of a required landscaped area that consists of: (1) undisturbed natural area; or (2) undisturbed existing trees; Page 2 of 62 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 (B)[(E)] [In addition to irrigation meeting the requirements of Subsection (A), supplemental] Supplemental irrigation using irrigation methods described in Subsection (C)[(F)] is required: (1) (2) (3) for the first two growing seasons for all or a portion of a newly planted required landscaped area without permanent irrigation; permanently for all newly planted trees in a required landscape area; and as prescribed by rule for all newly planted required landscaping located in medians, islands, or peninsulas. (C)[(F)] Irrigation required under Subsection (B) [subsection (E)] may be provided only by one or more of the methods described below: (1) an automatic irrigation system; (2) a hose attachment, if: (a) (b) the hose attachment is within 100 feet of the landscaped area or plant; and there is not a road or parking pavement between the hose attachment and the landscaped area or plan; or (3) a temporary, above ground automatic irrigation system, if the system complies with the water conservation requirements in the Environmental Criteria Manual. (D)[(G)] An irrigation method must: (1) (2) provide a moisture level adequate to sustain growth of the plant materials on a permanent basis; unless fiscal security is provided to the City for the installation of the system, be operational at the time of the final landscape inspection; and Page 3 of 62 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 (3) be maintained and kept operational. (E)[(H)] A site plan must show: (1) the drainage area(s) used to irrigate under Subsection B[(A)], including notation of the land uses on impervious areas within the drainage area(s); (2) the nature and location of an irrigation system; and (3) that there is no disturbance to the critical root zone of an existing tree. (F)[(I)] The director may grant an administrative variance to the requirements in this section [Section]. An applicant for a variance must demonstrate that: (1) strict compliance with this section [Section] is infeasible due to unique site conditions including but not limited to topography, size, shape, and location of existing features such as trees or previous development; and (2) the proposed irrigation plan is the minimal departure from the requirements of this section [Section]. PART 3. Subsection (B) of City Code Section 25-2-1179 (Environmental Protection) is repealed. The remaining subsections are renumbered accordingly. PART 4. Subsection (B) of City Code Section 25-5-3 (Small Projects) is amended to read: (B) The following are small projects: (1) construction of a building or parking area if the proposed construction: (a) does not require a variance from a water quality regulation; Page 4 of 62 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 (b) (c) does not exceed 5,000 square feet of impervious cover; and the construction site does not exceed 10,000 square feet, including the following areas: (i) construction; (ii) clearing; (iii) grading; (iv) construction equipment access; (v) driveway reconstruction; (vi) temporary installations, including portable buildings, construction trailers, storage areas for building materials, spoil disposal areas, erosion and sedimentation controls, and construction entrances; (vii) landscaping; and (viii) other areas that the director determines are part of the construction site; (2) (3) construction of a storm sewer not more than 30 inches in diameter that is entirely in a public right-of-way or an easement; construction of a utility line not more than eight inches in diameter that is entirely in a public right-of-way; (4) construction of a left turn lane on a divided arterial street; (5) construction of street intersection improvements; (6) widening a public street to provide a deceleration lane if additional right-of-way is not required; Page 5 of 62 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 (7) (8) (9) depositing less than two feet of earth fill, if the site is not in a 100 year floodplain and the fill is not to be deposited within the dripline of a protected tree; construction of a boat dock as an accessory use to a single-family residential use, duplex residential use, two-family residential use, or secondary apartment special use if shoreline modification or dredging of not more than 25 cubic yards is not required; or construction of a retaining wall, if the wall is less than 100 feet in length and less than eight feet in height, and the back fill does not reclaim a substantial amount of land except land that has eroded because of the failure of an existing retaining wall; (10) minor development that the director determines is similar to that described in Subsections (B)(1) through (9) of this section; (11) the replacement of development that is removed as a result of right-of-way condemnation; [and] (12) the construction of a telecommunications tower described in Subsection 25-2-839(F) or (G) (Telecommunication Towers); and (13) construction of a multi-family residential project that: (a) does not exceed 11 units, unless an additional number of units is allowed for a qualifying development under Chapter 25-1, Article 15, Division 4 (Affordability Unlocked Bonus Program); (b) is located on a platted residential lot that: (i) is not located within the Barton Springs Zone; (ii) does not exceed 55% impervious cover; and (iii) was originally part of a single family residential subdivision; and Page 6 of 62 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 (c) is located on a site of less than half an acre. PART 5. Subsection (A) of City Code Section 25-7-32 (Director Authorized to Require Erosion Hazard Zone Analysis) is amended to read: (A) The director may require the owner of real property to provide, at the owner's expense and as a condition for development application approval, an analysis to establish the erosion hazard zone if the proposed development is: (1) within 100 feet of the centerline of a waterway with a drainage area of 64 acres or greater; or (2) within 400 [100] feet of the ordinary high water mark of the Colorado River downstream from Longhorn Dam, as defined by Code of Federal Regulations Title 33, Section 328.3 (Definitions); or (3) located where significant erosion is present as determined by the director. PART 6. The definition of DIRECTOR in City Code Section 25-8-1 (Definitions) is amended to read: (7) DIRECTOR, when used without a qualifier, means the director of the Watershed Protection [Planning and Development Review] Department, or the director's designee. PART 7. Subsections (A), (B), and (C) of City Code Section 25-8-2 (Descriptions of Regulated Areas) are amended to read: (A) This section describes the watersheds, aquifers, and other water quality protection zones that are regulated by this subchapter. A map of these areas shall be [is] maintained by the Watershed Protection Department and made available for reference online and [inspection] at the offices of the Development Services [Planning and Development Review] Department. Page 7 of 62 185 186 187 188 189 190 191 192 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 (B) The director [of the Watershed Protection Department] shall determine the boundaries of the areas described in Subsection (D). (C) The director [of the Watershed Protection Department] may require an applicant to verify the boundary of an area described in Subsection (D). For property within 1,500 feet of an Edwards Aquifer recharge zone boundary, the director [of the Watershed Protection Department] may require that an applicant provide a certified report from a geologist or hydrologist verifying the boundary location. 193 PART 8. City Code Section 25-8-21 (Applicability) is amended to read: 194 § 25-8-21 APPLICABILITY. (A) Except as provided in Subsection (B), this subchapter applies in the planning jurisdiction. (B) For a preliminary plan, final plat, or subdivision construction plan in the portion of the city's extraterritorial jurisdiction that is within Travis County: (1) this subchapter does not apply; and (2) Title 30 (Austin/Travis County Subdivision Regulations) governs. (C) This subsection specifies regulations of this subchapter applicable to residential construction. (1) Within the planning jurisdiction, the following regulations apply to multi-family development that is eligible for approval under Subsection 25-5-3(B)(13) (Small Projects): (a) Section 25-8-63 (Impervious Cover Calculations); (b) Article 2 (Waterways Classified; Zones Established) for a legal tract or a lot platted on or after May 18, 1986, and for Page 8 of 62 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 development associated with boat docks, shoreline access, or shoreline modifications including bulkheads and bank stabilization; (c) Article 5 (Erosion and Sedimentation Control; Overland Flow); (d) Section 25-8-261 (Critical Water Quality Zone Restrictions), for a legal tract or a lot platted on or after May 18, 1986, and for development associated with boat docks, shoreline access, or shoreline modifications including bulkheads and bank stabilization; (e) Section 25-8-321 (Clearing of Vegetation); (f) Section 25-8-323 (Temporary Storage Areas; Topsoil Protection); (g) Section 25-8-341 (Cut Requirements); (h) Section 25-8-342 (Fill Requirements); (i) (j) Section 25-8-364 (Floodplain Modifications), for a legal tract or a lot platted on or after May 18, 1986, and for development associated with boat docks, shoreline access, or shoreline modifications including bulkheads and bank stabilization; Section 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E Long); (k) Article 13 (Save Our Springs Initiative); and (l) Municipal regulatory restrictions on a recorded plat or covenant, unless the restrictions are determined to be inapplicable under Chapter 25-1, Article 12 (Vested Rights). Page 9 of 62 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 (2) Within the planning jurisdiction, multi-family development that is not eligible for approval under Subsection 25-5-3(B)(13) (Small Projects) is subject to all requirements of this subchapter. (3) Within the zoning jurisdiction, one- and two-family residential development is subject to the regulations specified in Subsection (C)(1). PART 9. City Code Section 25-8-25 (Redevelopment Exception in Urban and Suburban Watersheds) is amended to read: § 25-8-25 REDEVELOPMENT EXCEPTION IN URBAN AND SUBURBAN WATERSHEDS. (A) This section applies to property located in an urban or suburban watershed that has existing development if: (1) (2) any development constructed without a permit after January 1, 1992, will be removed from the site and the area restored to pre-development conditions; [no unpermitted development occurred on the site after January 1, 1992,] and the applicant files a site plan application or concurrent subdivision and site plan applications and elects [the property owner files a site plan application and an election for the property] to be governed by this section. [(B) The requirements of this subchapter do not apply to the subdivision of property if at the time of redevelopment under this section subdivision and site plan applications are filed concurrently.] (B) [(C)] The requirements of this subchapter do not apply to the redevelopment of the property if the redevelopment: (1) does not increase the existing amount of impervious cover on the site; Page 10 of 62 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 (2) removes existing impervious cover from within 50 feet of a classified waterway, 50 feet from the shoreline of a lake, or 100 feet from the ordinary high water mark of the Colorado River; and revegetates the area as prescribed by the Environmental Criteria Manual; (3)[(2)] provides the level of water quality treatment prescribed by current regulations for the redeveloped area or an equivalent area on the site; [(3) does not generate more than 2,000 vehicle trips a day above the estimated traffic level based on the most recent authorized use on the property; (4) is consistent with the neighborhood plan adopted by council, if any;] (4)[(5)] does not increase non-compliance, if any, with Article 7, Division 1 (Critical Water Quality Zone Restrictions), Section 25-8-281 (Critical Environmental Features), or Section 25-8- 282 (Wetland Protection); (5) complies with Article 3 (Environmental Resource Inventory; Pollutant Attenuation Plan) and all construction phase environmental standards in effect at the time of construction, including Article 5 (Erosion and Sedimentation Control; Overland Flow); and (6) does not place redevelopment within the Erosion Hazard Zone, unless protective works are provided as prescribed in the Drainage Criteria Manual. [(D) The redevelopment must comply with Section 25-8-121 (Environmental Resource Inventory Requirement) and all construction phase environmental requirements in effect at the time of construction, including Chapter 25-8, Article 5 (Erosion and Sedimentation Control; Overland Flow).] Page 11 of 62 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 PART 10. Subsections (C) and (E) of City Code Section 25-8-26 (Redevelopment Exception in the Barton Springs Zone) are amended to read: (C) In this section: (1) (2) STANDARD POND [SEDIMENTATION /FILTRATION POND] means water quality controls that comply with Section 25-8-213 (Water Quality Control Standards) or are approved under Section 25-8-151 (Innovative Management Practices); and SOS POND means water quality controls that comply with all requirements of Section 25-8-213 (Water Quality Control Standards) and the pollutant removal requirements of Section 25-8-514(A) (Pollution Prevention Required). (E) The requirements of this subchapter do not apply to the redevelopment of property if the redevelopment meets all of the following conditions: (1) The redevelopment may not increase the existing amount of impervious cover on the site. (2) The redevelopment may not increase non-compliance, if any, with Article 7, Division 1 (Critical Water Quality Zone Restrictions), Section 25-8-281 (Critical Environmental Features), Section 25-8-282 (Wetland Protection), or Section 25-8-482 (Water Quality Transition Zone). (3) The redevelopment must comply with Section 25-8-121 (Environmental Resource Inventory Requirement) and all construction phase environmental requirements in effect at the time of construction, including Chapter 25-8, Article 5 (Erosion and Sedimentation Control; Overland Flow) and Section 25-8- 234 (Fiscal Security in the Barton Springs Zone). Page 12 of 62 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 (4) The water quality controls on the redevelopment site must provide a level of water quality treatment that is equal to or greater than that which was previously provided. (5) For a commercial or multifamily redevelopment, the owner or operator must obtain a permit under Section 25-8-233 (Barton Springs Zone Operating Permit) for both standard [sedimentation/filtration] ponds and SOS ponds. (6) For a site with more than 40 percent net site area impervious cover, the redevelopment must have: (a) (b) standard [sedimentation/filtration] ponds for the entire site; or SOS ponds for a portion of the site, and standard [sedimentation/filtration] ponds for the remainder of the redeveloped site. (7) For a site with 40 percent or less net site area impervious cover, the redevelopment must have SOS ponds for the entire site. (8) The property owner must mitigate the effects of the redevelopment, if required by and in accordance with Subsection (H). (9) Redevelopment may not be located within the Erosion Hazard Zone, unless protective works are provided as prescribed in the Drainage Criteria Manual. PART 11. City Code Section 25-8-27 (Redevelopment Exception in the Water Supply Rural and Water Supply Suburban Watersheds) is amended to read: § 25-8-27 REDEVELOPMENT EXCEPTION IN THE WATER SUPPLY RURAL AND WATER SUPPLY SUBURBAN WATERSHEDS. (A) This section applies to property located in a water supply rural or water supply suburban watershed that has existing commercial Page 13 of 62 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 development or existing residential development with greater than two dwelling units per lot if: (1) (2) any development constructed without a permit after January 1, 1992, will be removed from the site and the area restored to pre-development conditions; [no unpermitted development occurred on the site after January 1, 1992,] and the applicant files a site plan application or concurrent subdivision and site plan applications and elects [the property owner files a site plan application and an election for the property] to be governed by this section. (B) In this section, STANDARD [SEDIMENTATION/ FILTRATION] POND means water quality controls that comply with Section 25-8- 213 (Water Quality Control Standards) or are approved under Section 25-8-151 (Innovative Management Practices). [(C) The requirements of this subchapter do not apply to the subdivision of property if at the time of redevelopment under this section subdivision and site plan applications are filed concurrently.] (C)[(D)] The requirements of this subchapter do not apply to the redevelopment of property if the redevelopment meets all of the following conditions: (1) The redevelopment may not increase the existing amount of impervious cover on the site. (2) The redevelopment may not increase non-compliance, if any, with Article 7, Division 1 (Critical Water Quality Zone Restrictions), Section 25-8-281 (Critical Environmental Features), Section 25-8-282 (Wetland Protection), Section 25- 8-422 (Water Quality Transition Zone), or Section 25-8-452 (Water Quality Transition Zone). (3) The redevelopment must remove any existing impervious cover from within 50 feet of the centerline of a classified waterway or Page 14 of 62 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 50 feet form the shoreline of a lake and revegetate the area as prescribed in the Environmental Criteria Manual. (4)[(3)] The redevelopment must comply with Article 3 (Environmental Resource Inventory; Pollutant Attenuation Plan) [Section 25-8-121 (Environmental Resource Inventory Requirement)] and all construction phase environmental requirements in effect at the time of construction, including Chapter 25-8, Article 5 (Erosion and Sedimentation Control; Overland Flow). (5)[(4)] The water quality controls for the redeveloped areas or an equivalent area on the site must provide a level of water quality treatment that is equal to or greater than that which was previously provided. At a minimum, the site must provide standard [sedimentation/filtration] ponds for the redeveloped area or an equivalent area on the site. (6)[(5)] The applicant [property owner] must mitigate the effects of the redevelopment, if required by and in accordance with Subsection (D)[(G)]. (7)[(6)] Redevelopment may not be located within the Erosion Hazard Zone, unless protective works are provided as prescribed in the Drainage Criteria Manual. [(E) City Council approval of a redevelopment in accordance with Subsection (F) is required if the redevelopment: (1) includes more than 25 additional dwelling units; (2) is located outside the City's zoning jurisdiction; (3) is proposed on property with an existing industrial use; (4) is inconsistent with a neighborhood plan; or Page 15 of 62 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 (5) will generate more than 2,000 vehicle trips a day above the estimated traffic level based on the most recent authorized use on the property. (F) City Council shall consider the following factors in determining whether to approve a proposed redevelopment: (1) benefits of the redevelopment to the community; (2) whether the proposed mitigation or manner of development offsets the potential environmental impact of the redevelopment; (3) the effects of off-site infrastructure requirements of the redevelopment; and (4) compatibility with the City's comprehensive plan. ] (D)[(G)] Redevelopment of property under this section requires the purchase or restriction of mitigation land. (1) The combined impervious cover of the mitigation land and the portion of the redevelopment treated by sedimentation/filtration ponds may not exceed 20 percent of gross site area if in a water supply rural watershed or 40 percent of gross site area if in a water supply suburban watershed. (2) The mitigation requirement may be satisfied by: (a) (b) paying into the Water Supply Mitigation Fund a nonrefundable amount established by ordinance; transferring to the City in accordance with Paragraph (3) mitigation land approved by the director [of the Watershed Protection Department] within a water supply rural or water supply suburban watershed, either inside or outside the City's jurisdiction; Page 16 of 62 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 (c) placing restrictions in accordance with Paragraph (3) on mitigation land approved by the director [of the Watershed Protection Department] within a water supply rural or water supply suburban watershed, either inside or outside the City's jurisdiction; or (d) a combination of the mitigation methods described in Subparagraphs (a)—(c), if approved by the director [of the Watershed Protection Department]. (3) An applicant [A person] redeveloping under this section shall pay all costs of restricting the mitigation land or transferring the mitigation land to the City, including the costs of: (a) (b) (c) (d) an environmental site assessment without any recommendations for further clean-up, certified to the City not earlier than the 120th day before the closing date transferring land to the City; a category 1(a) land title survey, certified to the City and the title company not earlier than the 120th day before the closing date transferring land to the City; a title commitment with copies of all Schedule B and C documents, and an owner's title policy; a fee simple deed, or, for a restriction, a restrictive covenant approved as to form by the City Attorney; (e) taxes prorated to the closing date; (f) recording fees; and (g) charges or fees collected by the title company. (H) The Watershed Protection Department shall adopt rules to identify criteria [for director approval] under this section to ensure that the proposed mitigation, manner of development, and water quality Page 17 of 62 470 471 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 controls offset the potential environmental impact of the redevelopment. 472 PART 12. Section 25-8-42 (Administrative Variances) is amended to read: 473 § 25-8-42 ADMINISTRATIVE VARIANCES. (A) A variance under this section may not vary the requirements of Article 13 (Save Our Springs Initiative) [and may not be granted for development of a property if any portion of the property abuts or is within 500 feet of the shoreline of Lake Austin, measured horizontally]. (B) The director [of the Watershed Protection Department] may grant a variance from a requirement of: (1) Subsection 25-8-213(C) (Water Quality Control Standards) (2)[(1)] Section 25-8-261 (Critical Water Quality Zone Development), only if: (a) (b) (c) necessary to protect public health and safety, or if the type of development requiring the variance directly contributes to [it would provide] a significant, demonstrable environmental benefit, as determined by a functional assessment of floodplain health as prescribed by the Environmental Criteria Manual; [,] necessary to allow an athletic field in existence on October 28, 2013, to be maintained, improved, or replaced; [,] necessary to allow an athletic field to be located in an area not otherwise allowed under Subsection [Section] 25-8-261(B)(5); [, or] Page 18 of 62 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 (d) (e) (f) (a) (b) (c) necessary to allow a hard surfaced trail to be located in an area not otherwise allowed under Subsection [Section] 25-8-261(B)(3); necessary to allow the specified green stormwater infrastructure to be located in an area not otherwise allowed under Subsection 25-8-261(H); except in the Barton Springs Zone, necessary to allow a private driveway or private street to cross a critical water quality zone if the crossing is necessary to provide primary access to the right-of-way or the crossing is required to comply with public health and safety requirements; or (g) necessary to allow residential use of up to 11 units located on an existing single family platted lot. (3)[(2)] Section 25-8-261 (Critical Water Quality Zone Development), for development within an urban watershed, only if the proposed development: is located not less than 25 feet from the centerline of a waterway, is located outside the erosion hazard zone, unless protective works are provided as prescribed in the Drainage Criteria Manual, does not increase non-compliance, if any, with Article 7, Division 1 (Critical Water Quality Zone Restrictions), Section 25-8-281 (Critical Environmental Features) or Section 25-8-282 (Wetland Protection), and (d) restores native vegetation and soils if development is removed from the Critical Water Quality Zone; Page 19 of 62 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 (4)[(3)] Subsection 25-8-262(B) (Critical Water Quality Zone Street Crossings), only outside the Barton Springs Zone; (5)[(4)] Section 25-8-281 (Critical Environmental Features); (6)[(5)] Section 25-8-322 (Clearing for a Roadway); (7)[(6)] Section 25-8-341 (Cut Requirements) or Section 25-8- 342 (Fill Requirements), for a cut or fill of not more than eight feet: (a) in the desired development zone; [and,] (b) for a public primary or secondary educational facility[, within the desired development zone or the drinking water protection zone]; or (c) for residential construction of up to 11 units located on an existing single family platted lot. (8)[(7)] Subsection 25-8-343(A) (Spoil Disposal); (9)[(8)] Section 25-8-365 (Interbasin Diversion); or (10)[(9)] Subsection 25-8-392(B)(6) (Uplands Zone), Subsection 25-8-392(C)(6) (Uplands Zone), Subsection 25-8-423(D) (Uplands Zone), or Subsection 25-8-453(E) (Uplands Zone). (C) It is the applicant's burden to establish that the findings described in this Section have been met. (D) The director [of the Watershed Protection Department] may grant a variance described in Subsection (B) only after determining that development in accordance with the variance meets the objective of the requirement for which the variance is requested and: (1) for property in the Barton Springs Zone, the variance will result in water quality that is at least equal to the water quality achievable without the variance; Page 20 of 62 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 (2) (3) for a variance from Subsection 25-8-213(C), that the proposed water quality control is necessitated by unique site conditions, excluding any potential loss of impervious cover entitlements resulting from full compliance; for a variance from Section 25-8-261, that the development is necessary to allow a private driveway or private street to cross a critical water quality zone; The applicant must also demonstrate compliance with the following: (a) The crossing must span the active channel or use open bottom culverts as determined by the director; (b) In suburban watersheds, critical water quality zone buffer averaging must be applied to the extent feasible in order to minimize the area of the private driveway within the critical water quality zone impacted by the crossing. (c) The location of the crossing must minimize impacts to critical environmental features, protected and heritage trees, and slopes greater than 15%, and must minimize the amount of cut or fill necessary for construction. (d) The construction is not located in the Barton Springs Zone. (4) for a variance from Section 25-8-261, the development is necessary to allow residential construction of up to 11 units located on an existing single family platted lot if: (a) the modification is the minimum deviation necessary to ensure reasonable use and maintenance of the property for an existing nonconforming structure; (b) for new development, the director determines that: (i) the usable lot area cannot accommodate the assumed square footage of impervious cover Page 21 of 62 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 established under Section 25-8-64 (Impervious Cover Assumptions), after accounting for all applicable regulations; (ii) the total proposed impervious cover does not exceed the assumed square footage of impervious cover established under Section 25-8-64; and (iii) the development is the minimum deviation necessary to accommodate the development. (5)[(2)] for a variance from Subsection [Section] 25-8-261(B)(5), that the proposed work on or placement of the athletic field will have no adverse environmental impacts; (6) for a variance from Subsection 25-8-261(H), that the green stormwater infrastructure is: (a) (b) (c) not required for regulatory compliance with 25-8-211 (Water Quality Control Requirement); designed to capture runoff from existing, untreated impervious cover; and proposed in a location that is the minimum necessary departure from the code requirement; (7)[(3)] for a variance from Section 25-8-281, that the proposed measures preserve all characteristics of the critical environmental feature; (8)[(4)] for a variance from Section 25-8-341 or Section 25-8- 342, the cut or fill is not located on a slope with a gradient of more than 15 percent or within 100 feet of a classified waterway; Page 22 of 62 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 (9) for a variance from Section 25-8-341 or Section 25-8-342 necessary to allow residential construction of up to 11 units located on an existing single family platted lot, if: (a) for an existing nonconforming structure, the modification is the minimum deviation necessary to ensure reasonable use and maintenance of the property; or (b) for new development, the director determines that: (i) the usable lot area cannot accommodate the assumed square footage of impervious cover established under 25-8-64 (Impervious Cover Assumptions), after accounting for all applicable regulations; (ii) the total proposed impervious cover does not exceed the assumed square footage of impervious cover established under 25-8-64; and (iii) the development is the minimum deviation necessary to accommodate the development. (10)[(5)] for a variance from Subsection [Section] 25-8-343(A), use of the spoil provides a necessary public benefit. Necessary public benefits include: (a) roadways; (b) stormwater detention facilities; (c) public or private park sites; and (d) building sites that comply with Section 25-8-341 (Cut Requirements), Section 25-8-342 (Fill Requirements), and Chapter 25-7 (Drainage); [and] (11)[(6)] for a variance from Section 25-8-365, there are no adverse environmental or drainage impacts; and Page 23 of 62 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 (12)[(7)] a variance from Subsection 25-8-392(B)(6), Subsection 25-8-392(C)(6), Subsection 25-8-423(D), or Subsection 25-8- 453(E), the variance: (a) is the minimum deviation needed to provide necessary improvements for a public mobility project in the right- of-way; and (b) does not create significant adverse environmental impacts. (E) The [Watershed Protection Department] director shall prepare written findings to support the grant or denial of a variance request under this section. PART 13. Subsection (A) of City Code Section 25-8-62 (Net Site Area) is amended to read: (A) Net site area includes only the portions of a site that lie in an uplands zone and have not been designated for surface or subsurface wastewater irrigation. PART 14. Subsection (C) of Section 25-8-63 (Impervious Cover Calculations) is amended to read: (C) Impervious cover calculations exclude: (1) sidewalks in a public right-of-way or public easement; (2) multi-use trails open to the public and located on public land or in a public easement; controls; (3) water quality controls, excluding subsurface water quality (4) detention basins, excluding subsurface detention basins; (5) ground level rainwater harvesting cisterns, excluding subsurface cisterns; Page 24 of 62 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 (6)[(5)] drainage swales and conveyances; (7)[(6)] the water surface area of ground level pools, fountains, and ponds; (8)[(7)] areas with gravel placed over pervious surfaces that are used only for landscaping or by pedestrians and are not constructed with compacted base; (9)[(8)] porous pavement designed in accordance with the Environmental Criteria Manual, limited to only pedestrian walkways and multi-use trails, and located outside the Edwards Aquifer Recharge Zone; (10)[(9)] fire lanes designed as prescribed by the Environmental Criteria Manual, that consist of interlocking pavers, and are restricted from routine vehicle access; (11)[(10)] an access ramp for an existing single-family and duplex residential unit if: (a) a person with a disability requires access to a dwelling entrance that meets the requirements of the Residential Code, Section R320.6 (Visitable dwelling entrance); (b) the building official determines that the ramp will not pose a threat to public health and safety; (c) the ramp: (i) is no wider than 48 inches, except that any portion of a landing for the ramp required for turns may be no wider than 60 inches; and (ii) may have a hand railing, but may not have a roof or walls; and (d) the ramp is located in a manner that utilizes existing impervious cover to the greatest extent possible if: Page 25 of 62 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 (i) (ii) impervious cover on the property is at or above the maximum amount of impervious cover allowed by this title; or if placement of the ramp would result in the property exceeding the maximum amount of impervious cover allowed by this title; and (12)[(11)] a subsurface portion of a parking structure if the director [of the Watershed Protection Department] determines that: (a) the subsurface portion of the structure: (i) is located within an urban or suburban watershed; (ii) is below the grade of the land that existed before construction of the structure; (iii) is covered by soil with a minimum depth of two feet and an average depth of not less than four feet; and (iv) has an area not greater than fifteen percent of the site; the structure is not associated with a use regulated by Section 1.2.2 of Subchapter F of Chapter 25-2 (Residential Design and Compatibility Standards); the applicant submits an assessment of the presence and depth of groundwater at the site sufficient to determine whether groundwater will need to be discharged or impounded; [and] the applicant submits documentation that the discharge or impoundment of groundwater from the structure, if any, will be managed to avoid adverse effects on public health and safety, the environment, and adjacent property; and Page 26 of 62 (b) (c) (d) 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 (13) for purposes of residential building permit review only, no more than two feet of elevated, projecting elements such as eaves, overhangs, cantilevered portions of structures, balconies, awnings, and bay windows. This exemption does not apply to site plans or the calculation of the drainage charge under Section 15-2-5 (Impervious Cover Calculation). PART 15. City Code Section 25-8-64 (Impervious Cover Assumptions) is amended to add a new Subsection (E) to read: (E) The applicant must demonstrate that all proposed one- and two-unit residential lots have usable lot area that can reasonably accommodate the assumed square footage of impervious cover established by Subsection (B). The usable lot area must account for all applicable waterway setbacks, floodplains, steep slopes, critical environmental features, protected trees, on-site sewage facilities, and other relevant code restrictions. PART 16. Subsections (A), (B), (C), and (F) of City Code Section 25-8-92 (Critical Water Quality Zones Established) are amended to read: (A) In the water supply rural watersheds, water supply suburban watersheds, and Barton Springs Zone, a critical water quality zone is established along each waterway classified under Section 25-8-91 (Waterway Classifications). (1) The boundaries of a critical water quality zone coincide with the boundaries of the 100-year flood plain as determined under Section 25-7-6 (Determination of the 100-Year Floodplain), except: (a) for a minor waterway, the boundaries of the critical water quality zone are located not less than 50 feet and not more than 100 feet from the centerline of the waterway; (b) for an intermediate waterway, the boundaries of the critical water quality zone are located not less than 100 Page 27 of 62 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 feet and not more than 200 feet from the centerline of the waterway; for a major waterway, the boundaries of the critical water quality zone are located not less than 200 feet and not more than 400 feet from the centerline of the waterway; and for the main channel of Barton Creek, the boundaries of the critical water quality zone are located 400 feet from the centerline of the creek. (c) (d) (2) Notwithstanding the provisions of Subsections (A)(1)(a), (b), and (c), a critical water quality zone does not apply to a drainage ditch located parallel and adjacent to [previously modified drainage feature serving] a railroad or public roadway right-of-way if the ditch: [that does not possess any natural and traditional character and cannot reasonably be restored to a natural condition, as prescribed in the Environmental Criteria Manual.] (a) was designed and constructed primarily to serve the adjacent railroad or public roadway; (b) is not a segment or modification of a natural waterway; (c) (d) does not possess any natural and traditional character; and cannot reasonably be restored to a natural condition due to existing site constraints. (B) In the suburban watersheds, a critical water quality zone is established along each waterway classified under Section 25-8-91 (Waterway Classifications). Page 28 of 62 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 (1) (2) (3) For [for] a minor waterway, the boundaries of the critical water quality zone are located 100 feet from the centerline of the waterway.[;] For [for] an intermediate waterway, the boundaries of the critical water quality zone are located 200 feet from the centerline of the waterway.[;] For [for] a major waterway, the boundaries of the critical water quality zone are located 300 feet from the centerline of the waterway.[;] (4) The [the] critical water quality zone boundaries may be reduced to not less than 50 feet from the centerline of a minor waterway, 100 feet from the centerline of an intermediate waterway, [and] 150 feet from the centerline of a major waterway, and 200 feet from the ordinary high water mark of the Colorado River downstream of the Longhorn Dam if the overall surface area of the critical water quality zone is the same or greater than the surface area that would be provided without the reduction, as prescribed in the Environmental Criteria Manual.[; and] (5) Notwithstanding [notwithstanding] the provisions of Subsections (B)(1), (2), and (3), a critical water quality zone does not apply to a drainage ditch located parallel and adjacent to [previously modified drainage feature serving] a railroad or public roadway right-of-way if the ditch: [that does not possess any natural and traditional character and cannot reasonably be restored to a natural condition.] (a) was designed and constructed primarily to serve the adjacent railroad or public roadway; (b) is not a segment or modification of a natural waterway; (c) does not possess any natural and traditional character; and Page 29 of 62 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 (d) cannot reasonably be restored to a natural condition due to existing site constraints. (C) In an urban watershed, a critical water quality zone is established along each waterway with a drainage area of at least 64 acres. This does not apply in the area bounded by IH-35, Riverside Drive, Barton Springs Road, Lamar Boulevard, and 15th Street. (1) The boundaries of the critical water quality zone coincide with the boundaries of the 100-year floodplain as determined under Section 25-7-6 (Determination of the 100-Year Floodplain), provided that the boundary is not less than 50 feet and not more than 400 feet from the centerline of the waterway. (2) Notwithstanding the provisions of Subsection (C)(1), a critical water quality zone does not apply to a drainage ditch located parallel and adjacent to [previously modified drainage feature serving] a railroad or public roadway right-of-way if the ditch: [that does not possess any natural and traditional character and cannot reasonably be restored to a natural condition.] (a) was designed and constructed primarily to serve the adjacent railroad or public roadway; (b) is not a segment or modification of a natural waterway; (c) (d) does not possess any natural and traditional character; and cannot reasonably be restored to a natural condition due to existing site constraints. (F) Critical water quality zones are established along and parallel to the shorelines of the Colorado River downstream of Lady Bird Lake. (1) The shoreline boundary of a critical water quality zone coincides with the river's ordinary high water mark, as defined Page 30 of 62 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 by Code of Federal Regulations Title 33, Section 328.3 (Definitions). (2) The width of a critical water quality zone, measured horizontally inland, is 400 feet. [The inland boundary of a critical water quality zone coincides with the boundary of the 100-year floodplain as determined under Section 25-7-6 (Determination of the 100-Year Floodplain) except that the width of the critical water quality zone, measured horizontally inland, is not less than 200 feet and not more than 400 feet.] PART 17. Subsection (A) of City Code Section 25-8-121 (Environmental Resource Inventory Requirement) is amended to read: (A) An applicant shall file an environmental resource inventory with the director for proposed development located on a tract: (1) within the Edwards Aquifer recharge [or contributing] zone; [(2) within the Drinking Water Protection Zone; (3) containing a water quality transition zone;] (2)[(4)] containing a critical water quality zone; [or] (3)[(5)] with a gradient of more than 15 percent; (4) containing, or within 150 feet of, a potential or verified wetland feature as identified in a map maintained by the Watershed Protection Department and made available for reference online and at the offices of the Development Services Department. PART 18. Subsection (A) of City Code Section 25-8-182 (Development Completion) is amended to read: (A) Development is not completed until: (1) permanent revegetation is established; and Page 31 of 62 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 (2) the director [Planning and Development Review Department]: (a) receives the engineer's concurrence letter; and (b) certifies installation of the vegetation for acceptance. PART 19. Subsections (B) and (C) of City Code Section 25-8-184 (Additional Erosion and Sedimentation Control Requirements in the Barton Springs Zone) are amended to read: (B) A temporary erosion and sedimentation control plan and a water quality plan certified by a registered professional engineer and approved by the director [Planning and Development Review Department] is required. (1) The plans must describe the temporary structural controls, site management practices, or other approved methods that will be used to control of off-site sedimentation until permanent revegetation is certified as completed under Section 25-8-182 (Development Completion). (2) The temporary erosion control plan must be phased to be effective at all stages of construction. Each temporary erosion control method must be adjusted, maintained, and repaired as necessary. (C) The director [Planning and Development Review Department] may require a modification of the temporary erosion control plan after determining that the plan does not adequately control off-site sedimentation from the development. Approval by the director [Planning and Development Review Department] and the engineer who certified the plan is required for a major modification of the plan. PART 20. Subsection (A) of City Code Section 25-8-185 (Overland Flow) is amended to read: (A) Drainage patterns must be designed to: Page 32 of 62 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 907 908 909 910 911 912 (1) prevent erosion; and waterways; (2) maintain infiltration and recharge of local seeps, [and] springs, (3) attenuate the harm of contaminants collected and transported by stormwater; [and] (4) where feasible [possible], maintain and restore overland sheet flow, maintain natural drainage features and patterns, and disperse runoff back to sheet flow; and (5) where feasible, direct stormwater to landscape areas including islands, medians, peninsulas, and other similar areas. Exceptions to this requirement include: (a) (b) perimeter landscape areas that are not required to drain to a stormwater control measure; impervious areas on which the land use or activity may generate highly contaminated runoff, as prescribed by the Environmental Criterial Manual; and (c) impervious areas used for parking or driving of vehicles if located within the Edwards Aquifer recharge zone. PART 21. City Code Section 25-8-213 (Water Quality Control Standards) is amended to read: 906 § 25-8-213 WATER QUALITY CONTROL STANDARDS. (A) A water quality control must be designed in accordance with the Environmental Criteria Manual. (1) The control must achieve the load reduction standards prescribed in [provide at least the treatment level of a sedimentation/filtration system under] the Environmental Criteria Manual. Page 33 of 62 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 (2) An impervious liner is required for structural water quality controls over the Edwards Aquifer recharge zone [in an area where there is surface runoff to groundwater conductivity]. If a liner is required and there are multiple controls [are located] in series, liners are only required for the first control in the series [not required for the second or later in the series following sedimentation, extended detention, or sedimentation/filtration]. (3) The control must be accessible for maintenance and inspection as prescribed in the Environmental Criteria Manual. (B) A water quality control must capture and treat the water draining to the control from the contributing area. The required capture volume is: (1) the first one-half inch of runoff; and (2) for each 10 percent increase in impervious cover over 20 percent of gross site area, an additional one-tenth of an inch of runoff. (C) The required water quality treatment must be provided using green stormwater control measures, as prescribed in the Environmental Criteria Manual. (D) Notwithstanding Subsection (C), all or part of the required water quality treatment may be provided using other water quality controls for: (1) (2) areas with land uses or activities that may generate highly contaminated runoff, as described in the Environmental Criteria Manual; a project that provides water quality treatment for currently untreated, developed off-site areas of at least ten acres in size; or Page 34 of 62 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 (3) sites with impervious cover of greater than 90 percent gross site area. (E)[(C)] The location of a water quality control: (1) must avoid recharge features to the greatest extent possible; (2) must be shown on the slope map, preliminary plan, site plan, or subdivision construction plan, as applicable; and (3) in a water supply rural watershed, may not be in the 40 percent buffer zone, unless the control disturbs less than 50% of the buffer, and is located to maximize overland flow and recharge in the undisturbed remainder of the 40 percent buffer zone. (F)[(D)] This subsection provides additional requirements for the Barton Springs Zone. (1) Approval by the Watershed Protection Department is required for a proposed water quality control that is not described in the Environmental Criteria Manual. The applicant must substantiate the pollutant removal efficiency of the proposed control with published literature or a verifiable engineering study. (2) Water quality controls must be placed in sequence if necessary to remove the required amount of pollutant. The sequence of controls must be: (a) based on the Environmental Criteria Manual or generally accepted engineering principles; and (b) designed to minimize maintenance requirements. PART 22. Subsection (A) of City Code Section 25-8-214 (Optional Payment Instead of Structural Controls in Urban Watersheds) is amended to read as follows: (A) The director [of the Watershed Protection Department] shall identify and prioritize water quality control facilities for the urban watersheds Page 35 of 62 in an Urban Watersheds Structural Control Plan. The Environmental Commission [Board] shall review the plan annually [in January of each year]. PART 23. Subsection (B) of City Code Section 25-8-232 (Dedicated Fund) is amended to read: (B) An applicant shall pay the required fee into the fund: (1) for development that does not require a site plan, when the applicant posts fiscal security for the subdivision or requests that the director of the Development Services Department record the subdivision plat, whichever occurs first; or (2) for development that requires a site plan, when the site plan is approved. PART 24. City Code Section 25-8-233 (Barton Springs Zone Operating Permit) is amended to read: 983 § 25-8-233 BARTON SPRINGS ZONE OPERATING PERMIT. (A) In the Barton Springs Zone, the owner or operator of a commercial or multifamily development is required to obtain an annual operating permit for the required water quality controls. (B) To obtain an annual operating permit, an applicant must: (1) provide the director [Planning and Development Review Department] with: (a) a maintenance plan; and (b) the information necessary to verify that the water quality controls are in proper operating condition; and (2) pay the required, nonrefundable fee. 969 970 971 972 973 974 975 976 977 978 979 980 981 982 984 985 986 987 988 989 990 991 992 993 Page 36 of 62 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 (C) The director [Planning and Development Review Department] may verify that a water quality control is in proper operating condition by either inspecting the water quality control or accepting a report from a registered engineer. (D) The director [Planning and Development Review Department] shall issue an operating permit after determining that: (1) the applicant has complied with the requirements of Subsection (B); and (2) the water quality controls are in proper operating condition. (E) The director [Planning and Development Review Department] shall transfer an operating permit to a new owner or operator if, not later than 30 days after a change in ownership or operation, the new owner or operator: (1) signs the operating permit; (2) accepts responsibility for the water quality controls; and (3) documents the transfer on a form provided by the director [Planning and Development Review Department]. Part 25. Chapter 25-8, Article 7, Division 1 (Critical Water Quality Zone Restrictions) is renamed to read: 1013 Division 1. Waterway and Floodplain Protection. 1014 1015 PART 26. City Code Section 25-8-261 (Critical Water Quality Zone Development) is amended to read: 1016 § 25-8-261 CRITICAL WATER QUALITY ZONE DEVELOPMENT. 1017 1018 1019 In all watersheds, development is prohibited in a critical water quality zone except as provided in this Division. Development allowed in the critical water quality zone under this Division shall be revegetated and restored Page 37 of 62 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 within the limits of construction as prescribed by the Environmental Criteria Manual. (A) A fence that does not obstruct flood flows is permitted in a critical water quality zone. (B) Open space is permitted in a critical water quality zone if a program of fertilizer, pesticide, and herbicide use is approved by the Watershed Protection Department, subject to the conditions in this Subsection. (1) In a water supply rural watershed, water supply suburban, or the Barton Springs Zone, open space is limited to sustainable urban agriculture or a community garden if the requirements in subsection (B)(4) are met, multi-use trails, picnic facilities, and outdoor facilities, excluding stables, corrals for animals and athletic fields. (2) A [master planned] park with a council-adopted plan [that is approved by the council] may include recreational development other than that described in Subsection (B)(1). (3) A hard surfaced trail may cross the critical water quality zone pursuant to Section 25-8-262 (Critical Water Quality Zone Street Crossings). A hard surfaced trail that does not cross the critical water quality zone may be located within the critical water quality zone only if: (a) (b) designed in accordance with the Environmental Criteria Manual; located outside the erosion hazard zone unless protective works are provided as prescribed in the Drainage Criteria Manual; Page 38 of 62 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 limited to 12 feet in width plus one-foot compacted sub-grade shoulders, unless a wider trail is designated in a Council-adopted plan; located not less than 25 feet from the centerline of a waterway if within an urban watershed; located not less than 50 feet from the centerline of a minor waterway, 100 feet from the centerline of an intermediate waterway, and 150 feet from the centerline of a major waterway if within a watershed other than an urban watershed; located not less than 50 feet from the shoreline of Lake Travis, Lake Austin, Lady Bird Lake, and Lake Walter E. Long, as defined in Section 25-8- 92; and located not less than 200 [100] feet from the ordinary high water mark of the Colorado River downstream from Longhorn Dam. (c) (d) (e) (f) (g) (a) (4) Open space may include sustainable urban agriculture or a community garden only if: in an urban watershed and located not less than 25 feet from the centerline of a waterway, or in a watershed other than an urban watershed and located not less than 50 feet from the centerline of a minor waterway, 100 feet from the centerline of an intermediate waterway, and 150 feet from the centerline of a major waterway; (b) located not less than 50 feet from the shoreline of Lake Travis, Lake Austin, Lady Bird Lake, and Lake Walter E. Long, as defined in Section 25-8- 92; Page 39 of 62 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 (c) (d) (e) (a) (b) (c) (d) located not less than 200 [100] feet from the ordinary high water mark of the Colorado River downstream from Longhorn Dam; designed in accordance with the Environmental Criteria Manual; and limited to garden plots and paths, with no storage facilities or other structures over 500 square feet. (5) In a suburban or urban watershed, open space may include an athletic field only if: in an urban watershed and located not less than 25 feet from the centerline of a waterway, or in a suburban watershed and located not less than 50 feet from the centerline of a minor waterway, 100 feet from the centerline of an intermediate waterway, and 150 feet from the centerline of a major waterway; located not less than 50 feet from the shoreline of Lady Bird Lake and Lake Walter E. Long, as defined in Section 25-8-92; located not less than 200 [100] feet from the ordinary high water mark of the Colorado River downstream from Longhorn Dam; and the owner of the athletic field submits to the Watershed Protection Department a maintenance plan to keep the athletic field well vegetated and minimize compaction, as prescribed in the Environmental Criteria Manual. (C) The requirements of this subsection apply along Lake Travis, Lake Austin, Lake Walter E. Long, or Lady Bird Lake. Page 40 of 62 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 (1) A dock, public boat ramp, bulkhead or marina, and necessary access and appurtenances, are permitted in a critical water quality zone subject to compliance with Chapter 25-2, Subchapter C, Article 12 (Docks, Bulkheads, and Shoreline Access). For a single-family residential use, necessary access may not exceed the minimum area of land disturbance required to construct a single means of access from the shoreline to a dock. (2) Disturbed areas must be restored in accordance with the Environmental Criteria Manual and the following requirements: (a) Within a lakefront critical water quality zone, or an equivalent area within 25 feet of a shoreline, restoration must include: (i) at least one native shade tree and one native understory tree, per 500 square feet of disturbed area; and (ii) one native shrub per 150 square feet of disturbed area; and (b) Remaining disturbed areas must be restored per standard specifications for native restoration. (3) Within the shoreline setback area defined by Section 25- 2-551 (Lake Austin (LA) District Regulations) and within the overlay established by Section 25-2-180 (Lake Austin (LA) Overlay District), no more than 30 percent of the total number of shade trees of 8 inches or greater, as designated in the Environmental Criteria Manual, may be removed. (4) Before a building permit may be issued or a site plan released, approval by the Watershed Protection Page 41 of 62 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 Department is required for chemicals used to treat building materials that will be submerged in water. (5) Bank erosion above the 100-year-flood plain may be stabilized within a lakefront critical water quality zone if the restoration meets the requirements of Subsection (B) (2) of this section. (6) A retaining wall, bulkhead, or other erosion protection device must be designed and constructed to minimize wave return and wave action in compliance with the Environmental Criteria Manual. A shoreline modification within the wave action zone with a greater than 45 degree vertical slope for any portion greater than one foot in height is not allowed on or adjacent to the shoreline of a lake, unless the shoreline modification is located within an existing man-made channel. (7) A retaining wall, bulkhead, or other erosion protection device may not capture or recapture land from a lake unless doing so is required to restore the shoreline to whichever of the following boundaries would encroach the least into the lake: (a) the shoreline as it existed ten years prior to the date of application, with documentation as prescribed by the Environmental Criteria Manual; or (b) the lakeside boundary of the subdivided lot line. (8) A bulkhead may be replaced in front of an existing bulkhead once, if: (a) the existing bulkhead was legally constructed; Page 42 of 62 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 (b) (c) construction of the replacement bulkhead does not change the location of the shoreline by more than 6 inches; and the director determines that there is no reasonable alternative to replacement of the bulkhead in the location of the existing bulkhead. (9) Dredging is prohibited unless: (a) the area of dredging is less than 25 cubic yards; and (b) the dredging is necessary for navigation safety. (D) A new utility line or major replacement of an existing utility line, including a storm drain, or a utility easement associated with planned infrastructure, is prohibited in the critical water quality zone, except as provided in subsection (E) or for a necessary crossing. A necessary utility crossing may cross into or through a critical water quality zone only if: (1) (2) (3) the utility line follows the most direct path into or across the critical water quality zone to minimize disturbance, unless boring or tunneling is the proposed method of installation for the entire crossing and all bore pits are located outside of the critical water quality zone; the depth of the utility line and location of associated access shafts are not located within an erosion hazard zone, unless protective works are provided as prescribed in the Drainage Criteria Manual; stormwater outfalls minimize disturbance to the bank of the Colorado River by locating outfalls in upstream drainages where feasible; and Page 43 of 62 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 (4)[(3)] in the Barton Springs Zone, the crossing is approved by the director [of the Watershed Protection Department]. (E) In the urban and suburban watersheds, a new utility line or major replacement of an existing utility line, or a utility easement associated with planned infrastructure, may be located parallel to and within the critical water quality zone if: (1) (2) (3) (4) (5) (6) in an urban watershed and located not less than 50 feet from the centerline of a waterway, or in a watershed other than urban and located not less than 50 feet from the centerline of a minor waterway, 100 feet from the centerline of an intermediate waterway, and 150 feet from the centerline of a major waterway; located not less than 50 feet from the shoreline of Lady Bird Lake and Lake Walter E. Long, as defined in Section 25-8-92; located not less than 200 [100] feet from the ordinary high water mark of the Colorado River downstream from Longhorn Dam; designed in accordance with the Environmental Criteria Manual; located outside the erosion hazard zone, unless protective works are provided as prescribed in the Drainage Criteria Manual; and the project includes either riparian restoration of an area within the critical water quality zone equal in size to the area of disturbance in accordance with the Environmental Criteria Manual, or payment into the Riparian Zone Mitigation Fund of a non-refundable amount established by ordinance. Page 44 of 62 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 (F) In-channel detention basins and in-channel wet ponds are allowed in the critical water quality zone only if: (1) proposed as part of a public capital improvement project or public private partnership; (2) no alternative location is feasible; and (3) designed in accordance with the Environmental Criteria Manual. (G) Floodplain modification is [modifications are] prohibited in the critical water quality zone unless the modification proposed: (1) (2) (3) is [the floodplain modifications proposed are] necessary to address an existing threat to public health and safety, as determined by the director [of the Watershed Protection Department]; is designed solely to improve floodplain health [the floodplain modifications proposed would provide a significant, demonstrable environmental benefit,] as determined by a functional assessment of floodplain health as prescribed by the Environmental Criteria Manual; or is the minimum [the floodplain modifications proposed are] necessary for development allowed in the critical water quality zone under Section 25-8-261 (Critical Water Quality Zone Development), Section 25-8-262 (Critical Water Quality Zone Street Crossings), or Section 25-8-367 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long) as prescribed by the Environmental Criteria Manual. Page 45 of 62 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 (H) In the urban and suburban watersheds, vegetative filter strips, rain gardens, biofiltration ponds, areas used for irrigation or infiltration of stormwater, or other controls as prescribed by rule are allowed in the critical water quality zone if: (1) (2) (3) in an urban watershed and located not less than 50 feet from the centerline of a waterway, or in a watershed other than urban and located no less than 50 feet from the centerline of a minor waterway, no less than 100 feet from the centerline of an intermediate waterway, and no less than 150 feet from the centerline of a major waterway; located not less than 50 feet from the shoreline of Lady Bird Lake and Lake Walter E. Long, as defined in Section 25-8-92; located not less than 200 [100] feet from the ordinary high water mark of the Colorado River downstream from Longhorn Dam; (4) located outside the 100-year floodplain; and (5) located outside the erosion hazard zone, unless protective works are provided as prescribed in the Drainage Criteria Manual. (I) Development associated with power generation, transmission, or distribution at the Decker Creek Power Station is allowed in the critical water quality zone. (J) A residential lot that is 5,750 square feet or less in size may not include any portion of a critical water quality zone. 1275 1276 PART 27. Subsections (B) and (C) of City Code Section 25-8-262 (Critical Water Quality Zone Mobility Crossings) are amended to read: 1277 (B) This subsection applies in a watershed other than an urban watershed. Page 46 of 62 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 (a) (b) (a) (b) (1) A major waterway critical water quality zone may be crossed by a Level 3, 4, or 5 [an arterial] street or rail line identified in the Transportation Plan. (2) An intermediate waterway critical water quality zone may be crossed by a Level 2, 3, 4, or 5 [an arterial street, collector] street or rail line, except: a Level 2 [collector] street crossing must be at least 2,500 feet, measured along the centerline of the waterway, from a Level 2, 3, 4, or 5 [collector or arterial] street crossing on the same waterway; or in a water supply suburban or water supply rural watershed, or the Barton Springs Zone, a Level 2 [collector] street crossing must be at least one mile, measured along the centerline of the waterway, from a Level 2, 3, 4, or 5 [collector or arterial] street crossing on the same waterway. (3) A minor waterway critical water quality zone may be crossed by a Level 2, 3, 4, or 5 [an arterial street, collector] street[,] or rail line, except: a Level 2 [collector] street crossing must be at least 900 feet, measured along the centerline of the waterway, from a Level 2, 3, 4, or 5 [collector or arterial] street crossing on the same waterway; or in a water supply suburban or water supply rural watershed, or the Barton Springs Zone, a Level 2 [collector] street crossing must be at least 2,000 feet, measured along the centerline of the waterway, from a Level 2, 3, 4, or 5 [collector or arterial] street crossing on the same waterway. Page 47 of 62 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 (1) (2) (1) (2) (3) (4) (4) A minor waterway critical water quality zone may be crossed by a Level 1 or 2 [residential or commercial] street if necessary to provide access to property that cannot otherwise be safely accessed. (C) In all watersheds, multi-use trails may cross a critical water quality zone of any waterway if: designed in compliance with the Environmental Criteria Manual; and the development demonstrates no additional adverse impact from flood or erosion potential. Part 28. City Code Chapter 25-8 (Environment) is amended to add a new Section 25-8-263 to read: 1319 § 25-8-263 FLOODPLAIN MODIFICATION. (A) All floodplain modifications must: be designed to accommodate existing and fully-vegetated hydraulic conditions; apply sound engineering and ecological practices, prevent and reduce degradation of water quality, and demonstrate the stability and integrity of floodplains and waterways, as prescribed in the Environmental Criteria Manual; restore floodplain health, or provide mitigation if restoration is infeasible, to support natural functions and processes as prescribed in the floodplain modification criteria in the Environmental Criteria Manual; and comply with the requirements of Chapter 25-7 (Drainage), the Drainage Criteria Manual, and the Environmental Criteria Manual. Page 48 of 62 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 (B) Floodplain modification within a critical water quality zone is prohibited except as allowed under Section 25-8-261 (Critical Water Quality Zone Development). (C) Floodplain modification outside a critical water quality zone is allowed only if the modification proposed: (1) (2) (3) (1) (2) is necessary to protect public health and safety by addressing an existing threat, as determined by the director; is designed solely to improve floodplain health, as determined by a functional assessment of floodplain health as prescribed by the Environmental Criteria Manual; is located within a floodplain area classified as in fair or poor condition, as determined by a functional assessment of floodplain health, and provides restoration or mitigation in accordance with the ratios and specifications prescribed in the Environmental Criteria Manual; or (4) is the minimum modification necessary for development allowed under Section 25-8-261 (Critical Water Quality Development) or 25-8-262 (Critical Water Quality Zone Mobility Crossings). (D) If on-site restoration, as prescribed in the Environmental Criteria Manual, is infeasible and mitigation is required under this section, it may be satisfied by: paying into the Riparian Zone Mitigation Fund a nonrefundable amount established by ordinance; transferring in fee simple or placing restrictions on mitigation land approved by the director and meeting the following conditions: (a) located within the same watershed classification; Page 49 of 62 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 (b) (c) (d) in accordance with the procedures in Subsection (H)(3) of Section 25-8-26 (Redevelopment Exception in the Barton Springs Zone); dedicated to or restricted for the benefit of the City or another entity approved by the director and which the City or other approved entity accepts; and an amount proportionate to the amount of area within the existing floodplain that is proposed to be modified, as prescribed in the Environmental Criteria Manual; or (3) the mitigation methods described a combination of Subsections (D)(1) and (D)(2), if approved by the director. in 1372 1373 PART 29. Subsections (B) and (C) of City Code Section 25-8-281 (Critical Environmental Features) are amended to read: (B) A residential lot may not include a critical environmental feature or a critical environmental feature buffer zone and may not be located within 50 feet of a critical environmental feature. (C) This subsection prescribes the requirements for critical environmental feature buffer zones. (1) A buffer zone is established around each critical environmental feature described in this subchapter. (a) Except as provided in Subsection (C)(1)(b), the width of the buffer zone is 150 feet from the edge of the critical environmental feature. (b) For a point recharge feature, the buffer zone coincides with the topographically defined catchment basin, except that the width of the buffer zone from the edge of the critical environmental feature is: (i) not less than 150 feet; Page 50 of 62 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 (ii) not more than 300 feet; and (iii) calculated in accordance with the Environmental Criteria Manual. (2) Within a buffer zone described in this subsection: (a) the natural vegetative cover must be retained to the maximum extent practicable; (b) construction is prohibited; and (c) wastewater disposal or irrigation is prohibited. (3) If located at least 50 feet from the edge of the critical environmental feature, the prohibition of Subsection (C)(2)(b) does not apply to: (a) a [yard or] hiking trail; [or] (b) (c) a recharge basin approved under Section 25-8-213 (Water Quality Control Standards) that discharges to a point recharge feature; or[.] an innovative runoff management practice approved under Section 25-8-151 (Innovative Management Practices) that is designed to address the standards of this section, enhance the recharge of groundwater and the discharge of springs, and maintain the function of critical environmental features. (4) Perimeter fencing with not less than one access gate must be installed at the outer edge of the buffer zone for all point recharge features. The fencing must comply with the Standard Specifications Manual. (5) The owner must maintain the buffer zone in accordance with standards in the Environmental Criteria Manual to preserve the water quality function of the buffer. Page 51 of 62 1417 1418 1419 1420 1421 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 (6) All critical environmental feature locations and required setbacks must be shown on preliminary subdivision plans, site plans, and other permits as determined by the director. (7) All critical environmental feature locations must be shown on final plats. 1422 PART 30. City Code Section 25-8-282 (Wetland Protection) is amended to read: 1423 § 25-8-282 WETLAND PROTECTION. (A) Wetlands must be protected in all watersheds except for wetlands located within the area [in the] bounded by Interstate 35, Riverside Drive, Barton Springs Road, Lamar Boulevard, and 15th Street that are not associated with the critical water quality zone of Lady Bird Lake. (B) Protection methods for wetlands require the approval of the director, and may include: (1) appropriate setbacks that preserve the wetlands or wetland The functions; (2) wetland mitigation, including wetland replacement; or (3) wetland restoration or enhancement[; or] [(4) use of a wetlands for water quality controls]. [(C) The director of the Watershed Protection Department may approve: (1) the removal and replacement of a wetland; or (2) the elimination of setbacks from a wetland that is proposed to be used as a water quality control.] 1440 1441 PART 31. City Code Section 25-8-323 (Temporary Storage Areas; Topsoil Protection) is amended to add a new Subsection (C) to read: Page 52 of 62 1442 1443 1444 1445 1446 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 (C) For areas on the site that are to remain pervious after development, any soils that are compacted during site grading and construction operations must be decompacted in compliance with the Environmental Criteria Manual and the Standard Specifications Manual. 1447 PART 32. City Code Section 25-8-341 (Cut Requirements) is amended to read: 1448 § 25-8-341 CUT REQUIREMENTS. (A) Cuts on a tract of land may not exceed four feet of depth, except: (1) in an urban watershed; (2) in a roadway right-of-way; (3) for construction of a building foundation or swimming pool; (4) for construction of a water quality control or detention facility and appurtenances for conveyance such as swales, drainage ditches, and diversion berms, if: (a) (b) (c) the design and location of the facility within the site minimize the amount of cut over four feet; the cut is the minimum necessary for the appropriate functioning of the facility; and the cut is not located on a slope with a gradient of more than 15 percent or within 100 feet of a classified waterway; for utility construction or a wastewater drain field, if the area is restored to natural grade; in a state-permitted sanitary landfill or a sand or gravel excavation located in the extraterritorial jurisdiction, if: (a) the cut is not in a critical water quality zone; (5) (6) Page 53 of 62 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 (b) the cut does not alter a 100-year floodplain; (c) the landfill or excavation has an erosion and restoration plan approved by the City; and (d) all other applicable City Code provisions are met. (7) for any cut associated with construction of a multi-use trail, if: (a) the cut is not located on a slope with a gradient of more than 15 percent or within 100 feet of a classified waterway; (b) the cut is limited to no more than eight feet in depth; (c) (d) the cut is located in a public right-of-way or public easement; and the trail is designed in accordance with the Environmental Criteria Manual; or (8) for construction of a street or driveway necessary to provide primary access if: (a) the construction complies with Division 3 (Construction on Slopes) of this article; (b) the cut is not within a critical water quality zone; (c) the cut is limited to no more than eight feet in depth; (d) the cut over four feet is the minimum amount necessary to comply with safety access requirements and the horizontal and vertical curve requirements of the Transportation Criteria Manual; and (e) there is no other feasible alternative for the street or driveway location. Page 54 of 62  1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1493 1494 PART 33. Subsection (A) of City Code Section 25-8-342 (Fill Requirements) is amended to read: (A) Fill on a tract of land may not exceed four feet of depth, except: (1) in an urban watershed; (2) in a roadway right-of-way; (3) (4) under a foundation with sides perpendicular to the ground, or with pier and beam construction; for construction of a water quality control or detention facility and appurtenances for conveyance such as swales, drainage ditches, and diversion berms, if: the design and location of the facility within the site minimize the amount of fill over four feet; the fill is the minimum necessary for the appropriate functioning of the facility; and the fill is not located on a slope with a gradient of more than 15 percent or within 100 feet of a classified waterway; (5) for utility construction or a wastewater drain field; (6) in a state-permitted sanitary landfill located in the extraterritorial jurisdiction, if: (a) the fill is derived from the landfill operation; the fill is not placed in a critical water quality zone or a 100-year floodplain; the landfill operation has an erosion and restoration plan approved by the City; and (d) all other applicable City Code provisions are met; [or] Page 55 of 62 (a) (b) (c) (b) (c) 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 (7) for fill associated with construction of a multi-use trail, if: (a) the fill is not located on a slope with a gradient of more than 15 percent or within 100 feet of a classified waterway; (b) the fill is limited to no more than eight feet in depth; (c) (d) the fill is located in a public right-of-way or public easement; and the trail is designed in accordance with the Environmental Criteria Manual; or[.] (8) for construction of a street or driveway necessary to provide primary access if: (a) the construction complies with Division 3 (Construction on Slopes) of this article; (b) the fill is not within a critical water quality zone; (c) the fill is limited to no more than eight feet in depth; (d) the fill over four feet is the minimum amount necessary to comply with safety access requirements and the horizontal and vertical curve requirements of the Transportation Criteria Manual; and (e) there is no other feasible alternative for the street or driveway location. 1540 PART 34. City Code § 25-8-364 (Floodplain Modification) is repealed. 1541 1542 PART 35. City Code § 25-8-367 (Relocation of Shoreline Between Tom Miller Dam and Longhorn Dam) is repealed. 1543 1544 PART 36. City Code § 25-8-368 (Restrictions on Development Impacting Lake Austin, Lady Bird Lake, and Lake Walter E. Long) is repealed. Page 56 of 62 1547 1548 1549 1550 1551 1552 1553 1554 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1545 1546 PART 37. Subsection (A) of City Code Section 25-8-422 (Water Quality Transition Zone) is amended to read: (A) Development is prohibited in a water quality transition zone that lies over the South Edwards Aquifer recharge zone, except for: (1) development described in Article 7, Division 1 (Critical Water Quality Zone Restrictions); and (2) minor drainage facilities or water quality controls that comply with Section 25-8-263 [25-8-364] (Floodplain Modification) and the floodplain modification criteria in the Environmental Criteria Manual. 1555 1556 PART 38. City Code Section 25-8-452 (Water Quality Transition Zone) is amended to read: 1557 § 25-8-452 WATER QUALITY TRANSITION ZONE. (A) Development is prohibited in a water quality transition zone that lies over the South Edwards Aquifer recharge zone, except for: (1) development described in Article 7, Division 1 (Critical Water Quality Zone Restrictions); and (2) minor drainage facilities or water quality controls that comply with Section 25-8-263 [25-8-364] (Floodplain Modification) and the floodplain modification criteria in the Environmental Criteria Manual. (B) Development is prohibited in a water quality transition zone that lies outside the South Edwards Aquifer recharge zone, except for: (1) development described in Article 7, Division 1 (Critical Water Quality Zone Restrictions); (2) streets; Page 57 of 62 1571 1572 1573 1574 1575 1576 1577 1578 1579 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 (3) minor drainage facilities or water quality controls that comply with Section 25-8-263 [25-8-364] (Floodplain Modification) and the floodplain modification guidelines of the Environmental Criteria Manual; and (4) duplex or single-family residential development with a minimum lot size of two acres and a density of not more than one unit for each three acres, excluding acreage in the 100 year flood plain. (C) A lot that lies within a critical water quality zone must also include at least two acres in a water quality transition zone or uplands zone. 1580 1581 PART 39. City Code Section 25-8-482 (Water Quality Transition Zone) is amended to read: 1582 § 25-8-482 WATER QUALITY TRANSITION ZONE. (A) Development is prohibited in a water quality transition zone that lies over the Edwards Aquifer recharge zone, except for: (1) development described in Article 7, Division 1 (Critical Water Quality Zone Restrictions); and (2) minor drainage facilities or water quality controls that comply with Section 25-8-263 [25-8-364] (Floodplain Modification) and the floodplain modification criteria of the Environmental Criteria Manual. (B) Development is prohibited in a water quality transition zone that lies outside the Edwards Aquifer recharge zone, except for: (1) development described in Article 7, Division 1 (Critical Water Quality Zone Restrictions); (2) minor drainage facilities or water quality controls that comply with Section 25-8-263 [25-8-364] (Floodplain Modification) and the floodplain modification guidelines of the Environmental Criteria Manual; Page 58 of 62 1599 1600 1601 1602 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 (3) streets; and (4) duplex or single-family residential housing with a minimum lot size of two acres and a density of not more than one unit for each three acres, excluding acreage in the 100-year floodplain. 1603 1604 Part 40. City Code Chapter 25-8, Subchapter B, Article 2 (Endangered Species) is repealed. 1605 1606 Part 41. City Code Chapter 25-8, Subchapter B, is amended to add a new Article 2 to read: 1607 ARTICLE 2. THREATENED OR ENDANGERED SPECIES NOTIFICATION 1608 § 25-8-691 THREATENED OR ENDANGERED SPECIES NOTIFICATION. (A) This section applies in areas of the planning jurisdiction that may contain habitat for federally listed threatened or endangered species identified in the map maintained by the City online or available for inspection in the office of the Development Services Department. (B) On submission of an application for a subdivision or site plan in an area described in Subsection (A), the applicant must give notice of the application to the appropriate authority, including: (1) United States Fish and Wildlife Service; (2) Balcones Canyonlands Conservation Plan Coordinating Committee Secretary; and (3) Travis or Williamson County, as applicable depending on project location. (C) The notice must include a statement that the development could cause the loss of threatened or endangered species habitat. 1623 1624 PART 42. City Code Chapter 25-8 (Environment) is amended to add a new Subchapter C to read: Page 59 of 62  SUBCHAPTER C. FUNCTIONAL GREEN. 1625 1626 25-8-701 APPLICABILITY. (A) This subchapter applies in the zoning jurisdiction. (B) This subchapter applies to a site: (1) (2) in an urban watershed as defined in Section 25-8-1 (Definitions), with a maximum impervious cover greater than 80% as determined under Chapter 25-2 (Zoning); and in a watershed defined in Section 25-8-1 (Definitions) other than an urban watershed, with total allowable impervious cover greater than 80% gross site area as determined under Subchapter A. 1635 25-8-702 FUNCTIONAL GREEN REQUIREMENTS. A site plan for a site to which this subchapter applies shall: (A) meet or exceed a functional green score of 0.3 as calculated under Section 25-8-703 (Functional Green Score) and the Environmental Criteria Manual; (B) except for property zoned central business district or downtown mixed use district, comply with landscape requirements for a site plan per Chapter 25-2, Subchapter C, Article 9 (Landscaping) and the Environmental Criterial Manual; and (C) provide 100 percent of plant selections as prescribed by the Environmental Criteria Manual. 1646 25-8-703 FUNCTIONAL GREEN SCORE. A functional green score shall be calculated using the following steps: (A) Identify all proposed landscape elements, sorted into the categories in Table A. 1627 1628 1629 1630 1631 1632 1633 1634 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1647 1648 1649 Page 60 of 62 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 (B) Multiply the square feet, or equivalent square footage where applicable, of each landscape element by the multiplier in Table A and according to the following provisions: (1) If multiple elements listed in Table A occupy the same area, groundcover under a tree for example, count the full square footage or equivalent square footage of each element. (2) Landscaping elements in the right-of-way between the lot line and the roadway may be counted. (3) Elements in Table A that are provided to satisfy other regulations may be counted. (4) Provide a minimum of three different landscape elements from Table A, of which at least two landscape elements must be living elements; trees and shrubs or ornamental grasses of different sizes may be counted as different landscape elements. (C) Add together all the products calculated under Subsection (B) to determine the functional green numerator. (D) Divide the functional green numerator by the lot area, excluding public right-of-way, to determine the functional green score. Landscape element PLANTED AREA Existing tree Large, newly planted tree (mature width 40’ or greater) TABLE A. A B.1 B.2 Medium, newly planted tree (mature width 20-39’) B.3 C.1 C.2 D E F Small, newly planted tree (mature width 10- 19’) Large shrubs, ornamental grasses, or perennial forbs Small shrubs, ornamental grasses, or perennial forbs Groundcover Turf Vegetated wall Multiplier 0.8 0.6 0.5 0.4 0.3 0.3 0.2 0.1 0.5 Page 61 of 62  G.1 G.2 H I J K L M SPECIALIZED MEDIA Intensive vegetated (green) roof media (depth 12 inches or greater) Extensive vegetated (green) roof media (depth 6-11.9 inches) Rain garden Media ADDITIONAL ELEMENTS Irrigation with alternative water source Porous pavement Suspended pavement system BONUS OPTIONS Bonus: Pollinator resources Bonus: Publicly Accessible Green 0.6 0.5 0.3 0.2 0.2 0.2 0.05 0.05 1670 Page 62 of 62